Symptoms of Cold Sores (Herpes Simplex Type 1)

The first exposure to
the virus
may result in a blistering rash in the mouth and/or lips with a body-wide, flu-like illness. This first outbreak of cold sores is usually gone within 7-10 days, but it can last up to 20 days.
The sores can also develop in other locations on the skin.

After these initial symptoms, the virus may lie quietly in the nerves until it is reactivated. This may happen due to stress or illness. Direct sunlight, a weakened immune system, and menstruation can also trigger reactivation.

If reactivated, the virus will come out as a cold sore . A few days before the sore appears, you may notice some itching, burning, or pain in the area.
Some people have outbreaks regularly. Some never have another symptom after the initial infection.

The symptoms of an active cold sore are:

Small, painful, fluid-filled, red-rimmed blisters

After a few days, the blisters dry and form a scab

Scabs heal in about five days, usually without scarring or loss of sensation

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Herpes: Symptoms. American Academy of Family Physicians. Family Doctor website. Available at:
http://familydoctor.org/familydoctor/en/diseases-conditions/herpes/symptoms.html. Updated December 2010. Accessed February 17, 2014.